Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054e48b5e7124410393244fa9238d4cfc6862eaf598498155540812bb1b9f50f' 
  AND token = 'mcm04uFTv4UQdYNh3k4lSE04cVcukoVPRXB+tYp+nFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}